A source contains two species of phosphorous nuclei, ` "_15 ^32 P (T_1//2=14.3d) and `"_15 ^33 p (T_1//2=25.3d). at time`t= 0`, 10% of the decays are from `"_15^33P. How much time has to elapse for only 90% of the decays?

Choose the correct alternative from those given below each question: If for an A.P. d=10, what is t_6-t_2?

The figure shows the elliptical orbit of a planet about the sun S. An ellipse is the curve obtained when a cone is cut by an inclined plane. It has two focal points. The sum of the distances to the two focal points from every point on the curve is constant. F_1 " and " F_2 are the two focal points of the ellipse . The shaded area CF_1D is twice the shaded area AF_1B. t_1 is the time taken by the planet to move from C to D and t_2 is the time to move from A to B Which laws do we understand from the above diagram and description?

In an alpha decay, the daughter nucleus produced is itself unstable and undergoes further decay. If the number of parent and daughter nuclei at time t are Nl_p and N_d respectively and their decay constant are lambda_p and lambda_d respectively. What condition needs to be satisfied in order for Nd to remain constant ?

A projectile can have the same range R for two angles of projection. If t_1 and t_2 are the times of flight in the two cases, then the product of the two time of flight is proportional to A. R^2 B. frac(1)(R^2) C. frac(1)(R) D. R

A particle is moving such that its position coordinates (x, y) are (2m, 3m) at time t=0 . (6m, 7m) at time t= 2 s and (13m, 14m) at time t=5 s Average velocity vector from 0s to 5 s is

Show the position of the terms by t_1,t_2,t_3, for sequence 9,15, 21,...

A bakerman sells 5 types of cakes. Profit due to the sale of each type of cake is respectively Rs3, Rs 2.5, Rs 2, Rs 1.5, Rs 1. The demands for these cakes are 10%, 5%, 25%, 45% and 15% respectively.. What is he expected profit per cake?

Ina certain town, 40% of the people have brown hair, 25% have brown eyes, and 15% have both brown hair and brown eyes. If a person selected at random from the town has brown hair, the probability that he also has brown eyes is 1//5 b. 3//8 c. 1//3 d. 2//3